文献类型：期刊文献

英文题名：Process-induced micromechanics variations in additively manufactured 316 stainless steel characterised by quasi-in-situ EBSD

作者：Deng, Yangchao[1];Yang, Lu[1];Wu, Fan[1];Wen, Jianfeng[2];Mirihanage, Wajira[1];Yan, Kun[1];Zhang, Wenyou[3,4];Lupoi, Rocco[4]

机构：[1]Univ Manchester, Dept Mat, Manchester M13 9PL, England;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[3]Xi An Jiao Tong Univ, State Key Lab Mfg Syst Engn, Xian 710049, Shaanxi, Peoples R China;[4]Univ Dublin, Trinity Coll Dublin, Dept Mech Mfg & Biomed Engn, Dublin D02PN40, Ireland

年份：2026

卷号：275

外文期刊名：SCRIPTA MATERIALIA

收录：;EI(收录号：20260219891278);WOS:【SCI-EXPANDED(收录号:WOS:001659804500001)】；

基金：The authors gratefully acknowledge the funding by PoSAddive-Powder Sheet Additive Manufacturing (co-funded by EIT RawMaterials, Proposal no 22021) and Enterprise Ireland (CF-2020-1564-A/B) . The authors acknowledge EPSRC, UK grants EP/R00661X/1, EP/S019367/1, EP/P025021/1, and EP/P025498/1 (Henry Royce Institute) for enabling access to electron microscopy facilities. We acknowledge the technical contribution of Dr. Asli Coban from UCD and Prof. Ramesh Babu from TCD.

语种：英文

外文关键词：Additive manufacturing; Powder sheet; Microstructure; Deformation; EBSD

摘要：The strength-ductility trade-off remains a critical challenge in additively manufactured stainless steels due to their process-induced microstructures. In this study, type 316 stainless steel (SS316) was fabricated via a novel metal additive manufacturing technique employing powder sheets (MAPS), demonstrating exceptional strength with considerable ductility. To elucidate the mechanisms underlying this performance, quasi-in-situ electron backscatter diffraction (EBSD) was employed to monitor the microstructural evolution and deformation behaviour of SS316 produced by MAPS in comparison with laser powder bed fusion (LPBF). LPBF exhibits extensive deformation twinning that facilitates broad strain accommodation with sustained hardening, whereas MAPS shows dense dislocation storage within cellular substructures, leading to pronounced strain hardening and superior strength. The limited twinning activation in MAPS constrains strain redistribution, localising plasticity along cellular subgrain boundaries. The interplay between dislocation-dominated hardening and twinning-limited plasticity provides MAPS-processed SS316 with enhanced mechanical performance and highlights the importance of processing strategy in tailoring deformation pathways.